1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.os;
import android.annotation.UnsupportedAppUsage;
import android.os.Handler;
import android.os.Message;
import java.lang.ref.WeakReference;
/** @hide */
public class Registrant
{
@UnsupportedAppUsage
public
Registrant(Handler h, int what, Object obj)
{
refH = new WeakReference(h);
this.what = what;
userObj = obj;
}
@UnsupportedAppUsage
public void
clear()
{
refH = null;
userObj = null;
}
@UnsupportedAppUsage
public void
notifyRegistrant()
{
internalNotifyRegistrant (null, null);
}
@UnsupportedAppUsage
public void
notifyResult(Object result)
{
internalNotifyRegistrant (result, null);
}
public void
notifyException(Throwable exception)
{
internalNotifyRegistrant (null, exception);
}
/**
* This makes a copy of @param ar
*/
@UnsupportedAppUsage
public void
notifyRegistrant(AsyncResult ar)
{
internalNotifyRegistrant (ar.result, ar.exception);
}
/*package*/ void
internalNotifyRegistrant (Object result, Throwable exception)
{
Handler h = getHandler();
if (h == null) {
clear();
} else {
Message msg = Message.obtain();
msg.what = what;
msg.obj = new AsyncResult(userObj, result, exception);
h.sendMessage(msg);
}
}
/**
* NOTE: May return null if weak reference has been collected
*/
@UnsupportedAppUsage
public Message
messageForRegistrant()
{
Handler h = getHandler();
if (h == null) {
clear();
return null;
} else {
Message msg = h.obtainMessage();
msg.what = what;
msg.obj = userObj;
return msg;
}
}
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P)
public Handler
getHandler()
{
if (refH == null)
return null;
return (Handler) refH.get();
}
WeakReference refH;
int what;
Object userObj;
}
|